Sharpener for feed-cutters



c. A. HoLM.`

SHARPENER FOR FEED CUTTERS. APPLICATION FILED MAY l2. 1919.

' 1,339,511. Patented May11,192o.

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CHARLES A. HOLM, 0F TIGERTON, WISCONSIN.

SHARPENER FOR FEEDFCTTERS.

Specification ofLetters Patent.

Patented May 11, 1920.

Application med May 12, 1919. serial No. 296,444'.

To all 'whom t may concern:

Be` it known that l', CHA-ninas A. HoLM, a citizen of the United States,and resident of Tigerton, in the county of Shavvano andv State oflVi'sconsin, have invented certain new and useful Improvements inSharpeners for Feed-Cutters;` and I do' hereby declare that thefollowing is a full, clear and exact descriptionI thereof.

My invention relates to improvements in feed cutters or similarmachineshaving rotary commin-utirrg'blades, a-nd more particularly to means forsharpening. suclr bla'dbs during the normal operation of the machine' ofwhich they form a part.

It is the principali object of this inventioni to provide sharpeningmeans which may be readily associated with standard machines equippedWitl'r' rotary blades, or incorporated inA such machines being built.

A further object is toprovidea sharpening.

device which willc have a relatively universal yielding inovernei'itWith respect to the cutting bladesso that excessive abra'ding will beprevented, the' blades being only sufficiently engagedto valways retainth'em at their maximum sharpness.

A still further object is to proved simply' constructed for an abradingmember.

lVith these objects in view and others which Will become' apparent asthe description'` proceeds, my invention resides in cer-y tain novelfeatures of construction, combination andi arrangement of parts Whichwillbe hereinafter more particularly described and claimed and shown inthe drawing, in which: v

Figure 1 represents a vertical longitudinal sectional view through thekdischarge end portion of a feedt cutter or the like.

Fig. 2 is a relatively horizontal sectional vieW through the guardportion of a feed cutter showing the improved sharpening'. device inplan view, certain parts however, being' in section.y

rovide an imrol'ding. clamp Fig. is a detail elevational vievv, part-lyin section,of the means for supporting one end of the sharpeningdevice,and

Fig. L1 is'. a verticali sectional view of a modification'- of theinvention", this form be'- ing adapted to bey associated with feed?cutters andiv the like Which have already been' placed in operation.A

Referring to the accompanying drawing, especially to Figs. 1,2 and 3thereof, it Will beA noted' that l have depicted my invention incoperation' with a rotary knife 1 com prising radial. blade carryingarms 2 and slightly helical cutting blades Thisknife' 1 is mounted on atransverse drive shaft 11 located at the discharge en'dof the feedcutter indicated broadly by the character F and journa'led in bearingson the side barsV 5 thereof. The type of knife illustrated is'similar-to that used not only in feed cutters, but in many othermachines,` one of Whose operations consists `in cutting or choppinglengths ofmaterialy into small bits, and therefore it Will beappreciated that the invention may be usedv on feed' cutters and suchyother machines.

The form of the invention` used in the construction in the' figuresaboye referred to is designed to be incorporated in the machineduring'its manufacture and is therefore carried by a speciallyconstructed guard-hood@ It might be here .mentionedz that practicallyall standard feed cutters are provided with a guard-hood more or less'similar tothe hood 6 for' protecting lthe operator of the machine, suchguard being located over' the discharge chute to shield the'knife duringits rotation. The hood 6" has its bottom' and inner side open and issecured by lateral flanges 7 tothe ends of the side bars 5 by bolts orthe like 8.

The opposite side Walls 9' of the hood are each provided With a slot 10through which a pivot rod 11 extends. Each of the walls 9 adjacent theopening 10 therein is also provided with an outnmrdly projecting ear 12throughwhich a' shank 113 of an adjustable bearing' 14 extends. Said'shanks are screw-threaded to receive adjusting nuts 15 disposed on eachside of the ears 12.

The opposite ends of the pivot rodl 11 eX- tend through the openings inthe adjusta- 4ble bearings 14, and it Willi be noted that these openingsare considerably larger than the diameter of the rod and that resilientbushings 16 are disposed therein to form yieldable` bearings for said:rod. Nuts 17 on the opposite ends of the rod prevent the same fromshifting longitudinally Within said' bushings.

The pivot rod 11 is adapted to support a pair of spaced like abradingbar clamps 18,

- as the knife is rotated.

each of which comprises a plate 19 having a pivot ear 20 disposedintermediate its ends for journally mounting the same on the rod; oneend of the plate is shaped to form a clamp jaw 21 for coperation with asecond clamp jaw 22. A bolt or the like 23 connects the two clamp jawsand retains them in coperative position, the jaw 22 having a laterallyextending finger 24 engageable within a socket 25 on the plate 19whereby the said jaw can more effectively perform its function.

The opposite end of the plate 19 from the jaw 21 is longitudinallyslotted as at 26 to receive a spring rod 27 that extends from the topwall of the guard-hood 6 and carries a pair of expansile springs 28 and29, one of which is located on each side of the plate 19. The plate isthus urged to remain in one position and when rocked in either directionabout the pivot rod 11 it is returned to normal position when released.

The jaws of the two clamps 18 are designed to engage a pair of angleclamp bars 30 between which an elongated bar 31v of abrading material isdisposed. This bar 31 is so adjusted with respect to the cutting edgesof the blades 3 by means of the adjustable bearings 14 and adjustingnuts 27 on the ends of the spring rods 27 that it will be successivelyengaged by said blades i s hereinbefore set forth the abrading memberhas a` substantially universal yielding movement with respect to theblades 3 and from the foregoing described structure it will be obviousthat this is procured as a result of the resilient mounting of the pivotrod 11 and the springs 28 and 29. The resilient bushings 16 for thepivot rod 11 allow the latter, and consequently all of the parts carriedthereby, to yield away from the rotary knife whenever either of theblades 3 thereof strike against the bar 31; the pivotal connection ofthe clamp 18 with the pivot rod 11 permits the abrading member to beurged in the direction of movement of one of the blades 3 when engagedthereby.

I have attained similar movements yof the abrading bar 31 shown in Fig.4 in a manner slightly different from that just de- The form oftheinvention illustrated in this figure is designed to be associated with afeed cutter or the like whichl has already been placed in operation,such machine being equipped with a standard guard hood 6 detachablysecured to the ends of side bars 5 by means of bolts 8. Normally the endwalls 9 of the hood 6 are in flush engagement with said ends of the sidebars 5, but in mounting my invention on said hood, the latter is spacedfrom said ends of the side bars 5 by resilient washers 35. Likewisesimilar resilient washers 36 are disposed between the nuts 8 of Jhe(lnolts 8 and the attaching flanges of the Each of the clamps 18 used inthis form of my invention consists of a plate 19 having a clamp jaw 21and a socket 25. The coperating clamp jaw 22 of the first mentioned jawhas a finger 24" disposed in said socket 25, the abrading bar 31 beingsecured between said jaws 21 and 22 and clamp bars 30 by bolts 23. Theend of the plate 19 opposite the jaw 21 is apertured to receive theshank of an attaching bolt 37 that extends through an opening in onewall of the hood 6 adjacent its lower edge. A nut 38 threaded on saidshank secures the blade to the hood, a resilient washer 39, however,being interposed between the wall of the hood and the plate 19 beforeapplying said nut 38.

In this form of the invention the yielding of the abrading member 31 inthe direction of travel of one of the blades 3 is permitted by theresiliency of the washers 39 while said bar is permitted to be urgedaway from the blades when struck thereby by the resilient washers 35 and36. rIhe resilient nature of these washers, 35, 36 and 39 act similarlyto the resilient bushings 16 andthe springs 28 and 29 and return theparts to normal position when engagement between the several blades 3and the abrading member 31 no longer exists.

The preceding description setting forth the several forms of theinvention readily shows that various changes may be made in my ideawithout departing from the important features thereof or sacrificing anyof the advantages.

I claim:

1. In a device of the class described, a member adapted to be engaged bya movable cutting blade, and yieldable supporting means for the member,said member being urged in two different directions by the engagement ofthe blade.

2. In a device of the class described, a member adapted to be engaged bya movable cutting blade, and yieldable supporting means for the member,said member being simultaneously urged in two different directions bythe engagement of the blade.

3. In a device of the class described, a member adapted to be engaged bya movable cutting blade, and yieldable supporting means for the member,said member being urged in a line of direction substantiallytangentially'of the path of movement of the cutting blade and in a lineof direction substantially at right angles to said path.

4. In a device of the class described, a member adapted to bey engagedby a rotary cutting blade, and yieldable supporting means for themember, said member being urged in a line of direction substantiallytangentially of the path of movement of the cutting blade and in a lineof direction substantially diametrically of said path.

5. In a device of the class described, a lever, a shiiftable pivot forthe lever, and a contact member carried by the lever and adapted to beengaged by a cutting blade, said contact member defining orbital andrectilinear movement When engaged by the blade.

6. In a device of the class described, a support, a lever pivotedintermediate its ends, a yieldable bearing carried by the support andreceiving the pivot of the lever, a spring engaged With one end of thelever and resisting orbital movement of said end in either direction,and a vcontact member on the other end of the lever adapted to beengaged by a cutting blade, said member being shir'ted orbitally andrectilinearly When engaged by the blade.

'7. A clamp comprising a supporting plate having a socket, one end ofsaid plate formmg one Jaw member, a second Jaw member for coperationwith the first, a finger eX- tending from the second jaw member andremovably disposed in said socket, and a connecting member Joining thetWo jaw members for drawing the same together to 4 CHAS. A. HOLM.

